C
HAPTER
25
| General Security Measures
DHCPv6 Snooping
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EXAMPLE
This example enables DHCPv6 snooping globally for the switch.
Console(config)#ipv6 dhcp snooping
Console(config)#
RELATED COMMANDS
ipv6 dhcp snooping vlan (915)
ipv6 dhcp snooping trust (916)
ipv6 dhcp snooping
option remote-id
This command enables the insertion of remote-id option 37 information
into DHCPv6 client messages. Remote-id option information such as the
port attached to the client, DUID, and VLAN ID is used by the DHCPv6
server to assign preassigned configuration data specific to the DHCPv6
client. Use the no form of the command to disable this function.
SYNTAX
[no] ipv6 dhcp snooping option remote-id
DEFAULT SETTING
Disabled
COMMAND MODE
Global Configuration
COMMAND USAGE
C
OMMAND USAGE
â—† DHCPv6 provides a relay mechanism for sending information about the
switch and its DHCPv6 clients to the DHCPv6 server. Known as DHCPv6
Option 37, it allows compatible DHCPv6 servers to use the information
when assigning IP addresses, or to set other services or policies for
clients.
â—† When DHCPv6 Snooping Information Option 37 is enabled, the
requesting client (or an intermediate relay agent that has used the
information fields to describe itself) can be identified in the DHCPv6
request packets forwarded by the switch and in reply packets sent back
from the DHCPv6 server.
â—† When the DHCPv6 Snooping Option 37 is enabled, clients can be
identified by the switch port to which they are connected rather than
just their MAC address. DHCPv6 client-server exchange messages are
then forwarded directly between the server and client without having to
flood them to the entire VLAN.
â—† DHCPv6 snooping must be enabled for the DHCPv6 Option 37
information to be inserted into packets. When enabled, the switch will
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